GALERUCINE BEETLES — BLAKE 259 



Deinocladus, new genus 



Type species: Diabrotica pectinicornis Baly. 



Elongate oblong oval, the head with well-defined frontal tubercles 

 and a prominent carina down the lower front. Antennae in the male 

 with the third joint short and compressed, foiu'th joint very long, 

 joints five to eight becoming gradually larger, usually with a spur on 

 the outside, ninth joint much widened and lengthened, tenth joint 

 usually not quite so wide but also deformed, eleventh joint long and 

 slender. Prothorax with a lateral edge and a more or less transverse 

 sulcus across the disc, narrow but distinct in two species and only 

 apparent at the ends in the third species. Elytra a little wider in 

 apical half, in all three species the elytra piceous with a transverse 

 pale fascia or a large pale spot, the margin and apex pale. In one 

 species the elytra feebly costate. Anterior coxal cavities open, legs 

 long and slender, the middle tibiae in the male notched, first joint of 

 the hindlegs longer than the remaining joints together. Claws bifid. 



The unusual development of the antennae in the males of these 

 beetles together with the excised middle tibiae sufficiently differ- 

 entiate it from other genera. No female specimen of any of the three 

 species has been examined. 



The name Deinocladus is derived from the Greek 5etj^6s, meaning 

 "terrible," and /cXaSos, meaning "branch." 



Deinocladus pectinicornis (Baly) 



Figure 16 



Diabrotica pectinicornis Baly, Ent. Monthly Mag., vol. 25, p. 252, 1889; Trans. 

 Ent. Soc. London, p. 15, 1890. 



About 6 mm. in length, elongate oblong oval, shiny, the elytra 

 rather finely but distinctly punctate with faint costae along sides, the 

 intervals having a suggestion of geminate striate punctation, pale 

 yellow with the head, antennae, except tenth joint, tibiae and tarsi, 

 and two wide elytral bands piceous. Antennal joints in male with 

 apical spurs on the outside gradually widening, ninth and tenth 

 joints long, broad and distorted, terminal joint cylindrical and thin, 

 legs long, middle tibiae of male excised; claws bifid. 



Head with interocular space half width of head, entirely dark, 

 shiny, finely alutaceous with coarse dense punctures about median 

 line and depression on occiput, and a few finer scattered punctures on 

 the sides. Frontal tubercles much swollen, lower front with a promi- 

 nent carina down it, punctate on either side, lower front only mod- 

 erately long, not so long as in many Diabrotica. Antennae of male 

 very irregular, antennae of female unknown. In male the second 

 and third joints compressed into short rounded segments, with the 



